Keep our skills when Level syncing in dungeons

[Gullis]

How do you make a warrior with holmgang on par with a warrior without it?

How about astro cards? raid buffs? bard songs? dancer buffs? how do you make something scale with something that doesnt exist?

its like people only think damage spells and skills, but forget about utility abilities when making these. how do you make these scale? Because it seems like you either make higher level players have a huge advantage that would break the dungeons even worse than they are, or make them useless to the point where the whole change was pointless to being with

I'm not trying to be a smartass. Im just very curious how that would work?

Because it just seems like a impossible feat to me, without breaking the game. People mention SWTOR and sometimes Guildwars, but I got no clue about those games handles it.